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The vaccum pump should only work when put in 4 wheel drive.If the truck is running rough the vaccum pump isnt it.Suspect fuel filter, water in fuel, bad injector harness under valve covers.That truck will run bad also if the oil hasnt been changed periodically because the ipr valve cannot work right due to dirty oil and gives icp sensor a bad signal.That truck has the 7.3L , very good engine.

check the oil level ........ no oil pressure the ecu kill the pump may be the oil pump bad ........... if you press the gas pedal littlebit the engine start and keep runing and later on hapen again the idle valve is going bad

check engine light? check oil level, low oil possible engine damage.is there gas in tank?guages can lie, add a gallon if not sure. when key is turned on, not all the way to start, can you hear the fuel pump, an electric motor sound? have someone listen above the tank with trunk open or listen under tank. past this, check if spark plugs are working, remove a plug, put wire back on, rest plug on metal to ground, turn motor and check for spark. please rate answer.

Did you have changed a cylinder head gasket? Possible turn around. If not need to change oil pump.It is easy.Just remove the sump but before that drain the oil because........Get new sump gasket.What about oil pressure lamp?Coming ON? If the engine runing and the lamp is ON change oil pump.